Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d630678eaa54705…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 20:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 267d696310555b267ea8495b27f28fc0 SHA-1: 48ba2c9db7561e9c61986048d39798890912a5f1 SHA-256: 0d630678eaa54705e19e7494a7b21e67a603d3c5baf8c09dc91e26ad90053373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to facilitate initial access, likely via spearphishing, by redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nstyapi.com/resimler/files/8969087166.pdf In PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/61943453291.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/7756815160.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/mafasinutozitojuzeraf.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/wujopufiziwiteluregub.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/pomaneriraginawijajo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ifofgcavc0rvc1h6etha7rbm7f/sibixunol.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/14908185296.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dccab0da85454cf7baa4125fa9f419e5/78245066126.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/m52bl72tu7ie0bt3vcnd2ac4c4/39253579179.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/birixosakipo.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/99041875434.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/260423154533.pdfIn PDF document text
    • http://cssh.es/img/file/tumumumazuxiwu.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/mulobumegikopereliferoso.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/xadefoto.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e74364c917---lepevubibisaras.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/nusajole.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/886565c1872642650e594e3fddb75dda/67909797917.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7e3ed270df25aab7f07b8f4074fc5d1b/40666503573.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3398b0ae3---junapidixef.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/vewuwokaledexuzijozasu.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/47864812876.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16096756dc1725---15316240483.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/60050472110.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xirowamupile.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/dipig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=elkay+lzs8wslp+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 16304 bytes
SHA-256: a01e62e46fc89c3d346c6fd209a5025a5709a2823169f6846a06fe82e48b8dd6
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10388 bytes
SHA-256: 9c8903fcf4342ecff47d95b218d74e5b379a72af7e948ec63d03e48726d1b35f
font_02_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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